diff options
| -rw-r--r-- | content/posts/WIP-how-bsd-authentication-works/index.org | 32 |
1 files changed, 21 insertions, 11 deletions
diff --git a/content/posts/WIP-how-bsd-authentication-works/index.org b/content/posts/WIP-how-bsd-authentication-works/index.org index aec5d5a..5872eba 100644 --- a/content/posts/WIP-how-bsd-authentication-works/index.org +++ b/content/posts/WIP-how-bsd-authentication-works/index.org @@ -360,24 +360,34 @@ It sets the =name= and =style= of the session, if the =*style= and/or =*name= are non-=NULL=. - It then copies its variable arguments to the auth session's =va_list - ap=, which is used inside of =auth_call=. - - After that it constructs the path of the authentication module by - combining =_PATH_AUTHPROG=, which is defined in =login_cap.h= as + After that it constructs the path of the authentication module, + placing it in the variable =path=. It is constructed by combining + =_PATH_AUTHPROG=, which is defined in =login_cap.h= as =/usr/libexec/auth/login_=, and the authentication style. For the case of auth style =passwd=, it would result in the path =/usr/libexec/auth/login_passwd=. - Then =auth_call= is called with the struct, the path to the auth - module, the auth style, the "-s" flag followed by the service (login, - challenge, response), a double dash, the user name, and a =NULL= - character pointer. The return value of =auth_call= is ignored and a - pointer to the auth session is returned immediately afterwards. + #+begin_src c + snprintf(path, sizeof(path), _PATH_AUTHPROG "%s", style); + #+end_src + + It then copies its variable arguments to the auth session using + =auth_set_va_list=. + + Then =auth_call= is called with the session struct, the path to the + auth module, the auth style, the "-s" flag followed by the service + (=login=, =challenge=, or =response=), a double dash, the user name, + and a =NULL= character pointer. The return value of =auth_call= is + ignored and a pointer to the auth session is returned immediately + afterwards. #+BEGIN_SRC c + va_start(ap, name); + auth_set_va_list(as, ap); auth_call(as, path, auth_getitem(as, AUTHV_STYLE), "-s", - auth_getitem(as, AUTHV_SERVICE), "--", name, (char *)NULL); + auth_getitem(as, AUTHV_SERVICE), "--", name, (char *)NULL); + va_end(ap); + return (as); #+END_SRC * auth_call |